Creases and pinching in form faces

[Anonymous]

Sorry, I'm still pretty new at this so forgive me if I slip up on terminology and what not. Very much the hobbyist and not a professional engineer. Anyway, I'm working with form faces and wind up getting weird pinches and creases where I don't want them.

Here is how the faces look in the box model display, the arrows are pointing to the trouble issues. At this point the design appears to be where I want it. Things change in the smooth display mode.

Here it is in the smooth display mode. The edges take on a curve, which is undesirable. I did insert creases, but that is to keep the hard edges underneath the arrows. There is a crease on each edge where the arrows are pointing.

Here it is in the render mode, the pinch and crease are more noticeable. So what am I doing wrong. Is there some way to fix those issues. I've tried various manipulations using the modify tool but nothing works. I've also tried splitting faces, adding edges, and adding creases. To be honest I could probably live with the crease, but I really need to get rid of the pinch.

Thanks in advance for any help you can provide!

[TheCADWhisperer]

File>Export and then Attach your *.f3d file here.

[Anonymous]

Thanks for the reply, file is attached

[TrippyLighting]

T-Spline modeling generally works better when you model in quad faces only and also model predominantly in box view mode. An occasional 5-side polygon resulting in a T-Junction is OK if the surface quality is of no concern.

[Anonymous]

I was aware of those recommendations. Are you saying you see instances in the images attached of not using quad faces? If that's the case, maybe I don't fully understand what you mean by "quad faces".

[TrippyLighting]

A T-Junction creates at least a 5-sided face, which is NOT a quad face. A quad face is a polygon with 4 edges and 4 vertices.

[Anonymous]

Ah, okay. I think I started out with all quad face polygons, but when I subdivided some of them, they wound up creating T junctions. I was thinking they were still quad face polygons because of the shape, but now I understand what you're talking about, it added the vertices and edge. Unfortunately I only subdivided to try and fix this issue. Maybe I'll go back and remove the T junctions and see what happens.

Thanks for the tip.